Will the htt Stage IV kit improve my mileage? I only got 14.5 last tank and I didn't pull a trailer on that tank. I really want the whistle that gman got with his stage IV kit. Is that all he had done to his truck?

 

i don't think you would see a difference in MPG. But the sound is worth the money spent

 

Bump your timing. Info in the sticky, 2nd best mod to a 1st gen.
And yes it gets you better fuel mileage.

 

how much do you bump the timing though? I know how to do it but not sure how much to bump it.

 

If you dont have a dial indicator, go in 1/16" increments til you like it. I wouldnt go more than 3/16 without the dial indicator.

 

an 1/8 bump works well on close to stock trucks.

 

1/8 inch bump is great.